Restriction of url parameters in asp.net

I have updated a website 开发者_JAVA技巧i have made recently, using asp.net. The problem Im now encountering is this. If I send in the request parameters of a page: i.e. www.something.com/index.aspx?search=vendor, this url leads to a page stating "Command cannot execute". It used to work fine in my old version, and im still using the same iis server and the same database.

I have narrowed it down to note that if the word "vend" is found in the url it gives this error. I suspect this restriction is made in the asp.net project? If yes, how can I remove it. My users need to be able to send requests containing these letters.

i'm not sure but you might want to check the routing if there is any.